Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#477 Re: Puzzles and Games » Brain Teasers » 2008-08-02 07:07:13

13)
What number comes next in this sequence?
483, 759, 264, 837, ?
14)What, in connection with this question, is the next number below?
4, 13, 19, 21, 29, ?
15)
If 4x4 = 20,
then 5x6 = ?

#479 Re: Introductions » Hello I am Abhishek » 2008-08-02 05:40:30

hey Abhi.wave
hope you learn something everytime you visit.

#480 Re: Euler Avenue » Fermats Last Theorem » 2008-08-02 05:13:02

Ricky wrote:

You should listen to my warning.  Go to college, get an undergraduate degree in mathematics, then a few years in graduate school.  Then you can start trying.

Sry i didnt take your warning seriouly the first time but after reading the first 2 pages i think i shall.dizzyeek

#481 Re: Dark Discussions at Cafe Infinity » Where can I practice my cryptology? » 2008-08-02 05:07:35

None Taken ZHero. Anyways i have done all the ciphers from the book and i m just posting them on for ur fun. Tho I dont deny that i copy from a book. I learned from the book and i thought it was a gud way to learn, so i m just posting as it is.

#482 Re: Puzzles and Games » Brain Teasers » 2008-08-02 03:00:12

JohnnyReinB wrote:

post explanation because it might seem absurd to children in school. Thx.

#484 Re: Puzzles and Games » Brain Teasers » 2008-08-02 02:54:37

Excellent Answer Johnny and ZHero!upup

#485 Re: Maths Is Fun - Suggestions and Comments » Shapes Freeplay » 2008-08-01 15:20:48

How does the shape overlapping work? because if a shape is behind another shape you cannot see it. Try outlining a shape when it is overlapped.

#486 Re: Maths Is Fun - Suggestions and Comments » Shapes Freeplay » 2008-08-01 15:10:02

Green and Teal look very similar when tryin to select the color.

#487 Re: Maths Is Fun - Suggestions and Comments » Shapes Freeplay » 2008-08-01 15:08:07

I was just playing around on it whenm i noticed that when u put a shape over the color selection and the shape completely covers a button, you cannot click on that button.
You can ad the shapes but you cant select the color.down
Suggestion:
Make the color selection bar like the new shape bar.

#489 Re: Puzzles and Games » Brain Teasers » 2008-08-01 14:33:04

12)In a gathering of 50 people what is the probability of finding 2 persons whose birthday falls on the same date?

#490 Re: Puzzles and Games » Brain Teasers » 2008-08-01 14:28:45

ZHero wrote:

Sry i forgot to reply. Zhero you are right again! Great Job!!

#491 Re: Euler Avenue » Fermats Last Theorem » 2008-08-01 11:06:36

dizzyThx Jane that was very useful. Thats gonna occupy me for an year or so. I m goin to try and understand it if i can.

#493 Re: Dark Discussions at Cafe Infinity » Global Warming- It's Happening! » 2008-07-30 17:25:48

Its like the guy in matrix said we are a virus to the Earth. Thats exactly wat we are, so why not just kill evryone on the earth right now, than waiting for a painful death in the future.what

#494 Re: Puzzles and Games » Brain Teasers » 2008-07-30 16:22:56

11)
A man is runs into a forest. After running a mile, he is running out of the forest. How long is the forest?

#495 Euler Avenue » Fermats Last Theorem » 2008-07-30 14:37:33

careless25
Replies: 15

I was just reading about the theorem when i came upon that it was proved. I would like to see the proof. Or an explanation at the least how the Andrew Wiles proved the conjecture and used it prove the theorem. I m still in High School so i might not understand all of it but i cant believe it without seeing it.

#496 Re: Introductions » introducing. » 2008-07-30 14:24:00

John E. Franklin wrote:

Hi Mamo!  mammoth->mommath->mathmom ?

Mathmonster?

#497 Re: Introductions » Hey!! » 2008-07-30 14:22:00

bossk171 wrote:

EDIT: is your sig just nonsense, or does it mean something significant? My gut instinct says you're dividing in another base... but I haven't gotten around to figuring out which one.

Check comment #42 and onwards on this link:
http://www.mathisfunforum.com/viewtopic … =10425&p=2

#498 Re: Dark Discussions at Cafe Infinity » Where can I practice my cryptology? » 2008-07-30 14:12:57

Check out my post in Puzzles and Games section, i teach and post ciphers. Read, Learn, Solve!;)

#500 Re: Puzzles and Games » Ciphers » 2008-07-27 18:52:40

KEYWORDS

Another way to create a cipher alphabet is to scramble it in a methodical way. For example, if the keyword CRYPTO is chosen , then a cipher alphabet can be created by putting the word CRYPTO at the begginning, and follows it with the other letters of the alphabet that aren't in the keyword:

CRYPTOABDEFGHIJKLMNQSUVWXYZ

This results in a cipher alphabet that still has 26 letters, but is a bit more scrambled (and thereby harder to solve) than a simple Caesar Cipher.

This system can be used with any keyword, or even an entire keyphrase. If the key has any repeated letters, then only the first one is used, and he others are ignored:
Key: APPLE
CT=APLEBCDFGHIJKMNOQRSTUVWXYZ
or
Key: I Like Apples
CT=ILKEAPSBCDFGHJMNOQRTUVWXYZ

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